Together with parameter "filt_notchhigh" , this parameter specifies a set of 1 or more hard-edge band-cut frequency-domain notch filters, specifying additional frequencies to be removed by the initial data cleaning. The filt_notchlow value should be a comma-separated list of frequencies in Hz, enclosed in parentheses. These are the frequencies of the lower edges of the notch filters. The filt_notchlow and filt_notchhigh parameters should contain the same number of frequencies. [$<$undef$>$]

SC2CLEAN, MAKEMAP, CALCQU